: Issues with the motor encoder or cabling can send incorrect positional data to the NC, making the controller believe a massive deviation has occurred. Troubleshooting and Adjustment
If Parameter 1829 is set to less than 3000 µm, the machine will alarm during routine cutting. Therefore, plus margin for acceleration.
Use a dial indicator to measure actual lost motion during a direction change and update the value to match. To give you more specific advice, could you tell me: fanuc parameter 1829
sets the position deviation limit when the axis is stopped (at a standstill).
Changing this parameter should be a last resort after checking mechanics. How to Enable Parameter Write Enable (PWE) on a Fanuc CNC : Issues with the motor encoder or cabling
When an "Excess Error" alarm occurs related to this parameter, technicians often investigate the following:
FANUC Parameter 1829 is a cornerstone of your machine tool’s physical accuracy. Keeping this value synchronized across your linear axes, and ensuring it matches your spindle characteristics during tapping cycles, prevents costly excess error alarms and safeguards part quality. Treat loop gain adjustments with precision, maintain comprehensive backups, and your FANUC control will deliver reliable, high-accuracy performance for years to come. Use a dial indicator to measure actual lost
While standard cutting feeds utilize a general position loop gain (typically found in Parameter 1825), Parameter 1829 acts as a specialized multiplier or override value activated during high-precision synchronization cycles—most notably, rigid tapping. Why Parameter 1829 Matters
Defines the "In-Position" width (used to signal when a move is "finished").
Parameter 1829 defines the for servo motors. In simpler terms, it sets the maximum allowable deviation (position error) between the commanded position (where the CNC tells the axis to be) and the actual position (where the encoder says the axis is).
Loose couplings or faulty feedback signals may report incorrect position data to the CNC. en.industryarena.com How to Modify (If Necessary)